Parking Lock Cover Member Guiding Assembly
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Solution Overview
Problem
Conventional parking lock devices face workability issues due to the difficulty in accurately positioning the side cover, leading to inefficient assembly of the second case to the first case, as the shaft end portion and bearing portion do not fit smoothly unless precise positioning is achieved.
Innovation Solution
A cover member is fixed to the inner wall surface of the second case, covering the outer peripheral surface of the parking gear with a predetermined clearance, guiding the second case for easy joining and preventing erroneous attachment of the parking pole by utilizing distinct distances for the lock claw and pressed portion, while also featuring openings and arm portions to manage foreign substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the side cover is attached to the transmission case after the counter shaft is attached, then the parking lock device can be assembled, but the shaft end portion and bearing portion cannot be smoothly fitted unless positioning of the side cover is accurately conducted, deteriorating workability
Solution Approach 1:
The cover member is attached to the second case in advance before joining the first and second cases. This preliminary attachment provides a positioning reference that guides the bearing portion during assembly, enabling smooth fitting without requiring high positioning accuracy during the final joining operation.
Solution Approach 2:
The cover member acts as an intermediary element between the second case and the bearing portion. It provides a guiding surface that mediates the positioning process, allowing the bearing portion to be smoothly fitted onto the shaft end portion during case joining without requiring precise direct positioning between the shaft and case.
2Ease of manufacture
If the cover member covers the parking gear with predetermined clearance, then the second case can be easily joined to the first case, but the cover member must be precisely positioned to maintain proper clearance
Solution Approach 1:
The cover member is designed to automatically position itself during the case joining operation. The outer peripheral surface of the parking gear serves as a guide for the inner peripheral surface of the cover member, enabling self-positioning that maintains proper clearance without requiring additional positioning operations or high manufacturing precision.
3Device complexity
If the parking pole is attached without directional identification, then assembly is simple, but erroneous attachment of the parking pole may occur
Solution Approach 1:
The cover member is designed with asymmetric features including a first opening positioned at a specific location and arm portions extending at specific angles. These asymmetric features create a unique fit that allows the parking pole to be attached only in the correct orientation, preventing erroneous attachment while maintaining simple assembly procedures.
Data Source
AI summary
A parking lock device includes: a transmission shaft supported by a first case and a second case and connected to drive wheels; a parking gear fixed to the transmission shaft; and a parking pole engageable with the parking gear. A cover member is fixed to an inner wall surface of the second case. The cover member covers at least an outer peripheral surface of the parking gear with a predetermined clearance therebetween in a state where the second case is joined to the first case. When the second case to which the cover member is attached in advance is joined to the first case to which the parking gear is attached in advance, the cover member is guided by the outer peripheral surface of the parking gear. Thus, the second case 13 can be joined to the first case easily.